EMPLOYEE BENEFIT PLANS - SERP changes in benefit obligation, the funded status of the plan, components of pension expense (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in Projected Benefit Obligation:
Actuarial Loss (Gain)	$ 7,642,000	$ 815,000	$ 3,470,000
Components of Net Periodic Benefit Costs:
Amortization of Prior Service Cost	15,000	199,000	223,000
Net Loss Amortization	(4,623,000)	(5,299,000)	(4,409,000)
Net Periodic Benefit Cost	(3,004,000)	4,683,000	1,162,000
Supplemental Executive Retirement Plan ("SERP") [Member]
Change in Projected Benefit Obligation:
Benefit Obligation at Beginning of Year	8,860,000	7,285,000	5,741,000
Interest Cost	349,000	227,000	191,000
Actuarial Loss (Gain)	1,035,000	1,348,000	1,353,000
Projected Benefit Obligation at End of Year	10,244,000	8,860,000	7,285,000
Funded Status of Plan and Accrued Liability Recognized at End of Year:
Other Liabilities	10,244,000	8,860,000	7,285,000
Accumulated Benefit Obligation at End of Year	8,778,000	7,557,000	6,485,000
Components of Net Periodic Benefit Costs:
Interest Cost	349,000	227,000	191,000
Amortization of Prior Service Cost	0	0	0
Net Loss Amortization	761,000	1,626,000	597,000
Net Periodic Benefit Cost	$ 1,110,000	$ 1,853,000	$ 788,000
Weighted-average used to determine the benefit obligations:
Discount Rate (in percent)	3.16%	4.23%	3.53%
Rate of Compensation Increase (in percent)	4.00%	4.00%	3.25%
Measurement Date	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Weighted-Average Assumptions Used to Determine Benefit Cost:
Discount Rate (in percent)	4.23%	3.53%	3.92%
Rate of Compensation Increase (in percent)	3.50%	3.25%	3.25%
Amortization Amounts from Accumulated Other Comprehensive Income:
Net Actuarial Loss (Gain)	$ 1,035,000	$ 1,348,000	$ 1,353,000
Prior Service Cost	0	0	0
Net Loss	(761,000)	(1,626,000)	(597,000)
Deferred Tax (Benefit) Expense	(70,000)	71,000	(77,000)
Other Comprehensive Loss, net of tax	204,000	(207,000)	679,000
Amounts Recognized in Accumulated Other Comprehensive Income:
Net Actuarial Loss	(1,622,000)	(1,348,000)	1,626,000
Prior Service Cost	0	0	0
Deferred Tax Liability (Benefit)	(411,000)	(341,000)	(412,000)
Accumulated Other Comprehensive Loss (Gain), net of tax	$ 1,211,000	$ 1,007,000	$ 1,214,000